Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc257b1035a47499…

MALICIOUS

PDF

78.1 KB Created: 2021-03-27 21:49:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 827912194eef930c284153aacc70f341 SHA-1: 2e3ff21b5667452d2186a71fbd83b251fc93f415 SHA-256: fc257b1035a47499eccd32f1de3bc11889bf6c429656b9abbfd31d21daf27c18
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many of which are to benign-looking documents, but one key URL points to a domain associated with malicious activity. The heuristic 'PDF_SEO_LINK_FARM' suggests the PDF is part of a link farm designed to distribute malicious content, likely through phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://dafemum.ru/123?utm_term=rectification+of+errors+class+11+notes+pdf
    • http://zasaluto.iblogger.org/arm_compiler_6._6._1.pdf
    • https://tawixepew.weebly.com/uploads/1/3/0/7/130739069/dexoropasojajul-gimewodifi.pdf
    • https://wapofaxuza.weebly.com/uploads/1/3/5/9/135992917/9f37809e364d7f5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fapabuzoliwesaz.epizy.com/reading_skills_practice_test_2_answers.pdf
    • http://bufezesaj.epizy.com/albert_pike_camping_arkansas.pdf
    • https://uploads.strikinglycdn.com/files/e72ced79-a0cb-4a9b-9a3a-00e163d08204/how_much_do_science_engineers_make.pdf
    • https://s3.amazonaws.com/lepefi/health_and_safety_policy_template_alberta.pdf
    • https://uploads.strikinglycdn.com/files/d22ac8a8-9b60-4388-98d5-7f9a8bacda47/the_twilight_saga_eclipse_part_3_full_movie_in_hindi_download_720p.pdf
    • https://s3.amazonaws.com/legipalofi/72384893849.pdf
    • https://uploads.strikinglycdn.com/files/6919c124-e63a-4bc6-b33c-5f0df0e9e31a/does_verizon_have_any_deals_right_now.pdf
    • http://tobizexajivuvob.epizy.com/biology_keystone_review_packet_answers.pdf
    • https://s3.amazonaws.com/devuxuzejozam/xewawatutinivanikiza.pdf
    • https://uploads.strikinglycdn.com/files/6b7b4930-7566-451f-8755-598fc6c610c8/botimupadajuzebidodipefaj.pdf
    • https://s3.amazonaws.com/gowebabuxogiro/how_to_replace_panasonic_microwave_door_release_button.pdf
    • https://uploads.strikinglycdn.com/files/677fa8df-88d2-4c8b-892c-a404a7de62fa/77397442159.pdf
    • https://s3.amazonaws.com/lerezazo/9341629291.pdf
    • http://zosowafux.epizy.com/ocr_to_word_converter_online_free_without_email.pdf
    • http://sitowofe.rf.gd/wedegudadam.pdf
    • http://muvixozawasozet.epizy.com/rivinexaluwoziv.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f333.bin
40c0e4a3e4e7a5da3c1d1215d501cd936ed372c960c1e1588be839ce6b2137fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF333 5208 bytes
font_01_sfnt_off00010505.bin
aa93b406477384b501855b9aa86d38dccbd88879465d60215ff5d42b64c9c17c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10505 11108 bytes

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